Boring-bar.



PATENTED DEC. 20, 1904.

W. N. JOHN.

BORING BAR.

APPLIOATION FILED FEB. 15, 1904.

N0 MODEL.

A TTORN EYS W/TNESSES WILLIAM N. JOHN, OF MILWAUKEE,

Patented December 20, 1904.

PATENT ()FFICE.

WVISOONSIN, ASSIGNOR TO DAVID 0.

JOHN, SR, OF OSHKOSH, WISCONSIN.

BORING-BAR.

SPECIFICATION forming part of Letters Patent No. 777,952, dated December 20, 1904.

Application filed February 15,

To all whom it may concern.-

Be it known that I, WILLIAM N. JOHN, a citizen of the United States, residing at Milwaukee, county of Milwaukee. and State of VViscousin, havein vented new and useful Improvements in Boring-Bars, of which the following is a specification.

My invention relates to improvements in that class of boring-tools which is used for bor- Io ing tapered holes; and it pertains, first, to the mechanism for feeding the cutting-tool and tool-supporting carriage at any desired angle to the longitudinal axis of the boring-bar; second, to the means for adjusting the support- 5 ing-guideways upon which the carriage of the cutting-tool is moved at various angles to the longitudinal axis of the boring-bar, whereby the taper of the hole may be changed as circumstances may require.

The construction of my invention is explained by reference to the accompanying drawings, in which- Figure 1 represents a top view. Fig. 2 represents a longitudinal section drawn on line 2 5 m m of Fig. 1. Fig. 3 is a transverse section drawn on line y y of Fig. 1. Fig. 4: is a trans verse section drawn on line of Fig. l, and Fig. 5 is a transverse section drawn on line 2f 2, of Fig. 1.

Like partsare identified by the same reference-letters throughout the several views.

My boring-tool comprises the boring-bar A, shank B, by which the tool is supported from the head-block of a lathe in the ordinary man- 3 5 ner, carriage-supporting ways O, tool-supporting carriage D, cutting-tool E, screwthreaded feed-shaft F, the means, substantially as shown, for communicating motion from the feed-shaft F to the carriage D, and

4 means for communicating a rotary movement to the feed-shaft F as the tool is revolved in the lathe. The feed-shaft F is supported at its respective ends in the journal-bearings G and H, respectively. Motion is communi- 45 cated to the feed-shaft F as the tool is being revolved through the star-wheel l, shaft J, and bevel-gears K and L. I

Itwill be understood that the boring-tool comprising the several parts named is when 1904. Serial No. 193,579.

used revolved upon its longitudinal axis around a common center, and motion is communicated to the star-wheel I, and the same is revolved a partial revolution with each revolution of the cutting-tool around its central axis by contact of the arms M with a stationary stop N, motion being communicated, as stated, from the star-wheel I through the shaft J and bevel-gears K and L, to the feed-shaft F, whereby the carriage, with the cutting-tool, is fed forward a short distance with each revolution of the boring-tool. A forward movement is communicated from the feed-shaft F to the carriage D through the screw-threaded collar 0, sleeve P, and trunnion Q. The trunnion Q, is rigidly connected at its upper end to the carriage D and has slidable bearings a at its lower end in the sleeve P, which slidable bearings permit of the adjustment of the carriage-supporting ways C nearer to or farther from the longitudinal center of the cutting-. tool, as may be required in cutting holes of various tapers.

It will be understood that the feed-shaft F is non-adjustable and is therefore always retained at the same angle to the longitudinal center of the boring-tool, and when used in connection with rigid non-adjustable carriagesupporting ways the tool can be used for boring holes with but one taper only. hen, however, it is desirous to provide a tool which will bore holes of different tapers, the ways O are formed in a separate piece from the boring-bar A and are pivotally connected therewith at one end by the trunnions R R, while the opposite end of said ways is adjustable nearer to or farther from the feed-shaft F by the adjusting-screws S. The adjustingscrews S have screw-threaded hearings in the ways C, while their lower ends have contactbearings T with the bar A. Thus it will be obvious that by turning down the screws S against their contact-bearings the free end of the ways C will be moved away from the feedshaft F and the taper cut by the tool diminished, while by turning the screws S in the outward or opposite direction the taper of the bore will be increased. It will be obvious that by this arrangement if the free ends of the ways are adjusted as far above the longitudinal center of the boring-tool as the longitudinal center of the feed-shaft is below such longitudinal center of the tool the tool can be used'for cutting a straight hole. Thus by adjusting the ways C toward or from the longitudinal center of the tool any desired taper may be bored. When the carriage, with the cutting-tool, has traversed the length of the feed-shaft F, they can be readjusted at the opposite end of said feed-shaft by turning said shaft in the opposite direction, which is done by placing a crank or wrench upon the rectangular bearings U of the protruding end of said feed-shaft. To prevent the feedshaft F from moving longitudinally in its bearings, I preferably provide the same with an annular flange V, which flange V contacts upon one side with the inwardly-projecting annular shoulder W and upon the opposite side with the sleeve Y. The sleeve Y is held in place against said flange V by the set-screw A. The cutting-tool E is secured in place in the carriage D in the ordinary manner by a set-screw B. When the carriage-supporting Ways 0 have been adjusted in the manner described, they are locked in place by a plurality of set-screws G, which have screw-threaded bearings in the respective sides of the boringbarA and impinge at their inner ends against the downwardly-projecting flanges D D, which flanges D are formed integrally with the carriage-supporting ways (1.

It will be understood that the stop N is rigidly connected with any convenient part of the tool-supporting carriage in any convenient manner and that as the star-wheel is revolved around the longitudinal center of the boring-tool the arms M of said wheel are successively brought in contact with said arm M, each remaining in contact until said starwheel in passing said stop is caused to turn on its own axis far enough to bring the next succeeding arm M in contact with said stop with the next succeeding revolution of said star-Wheel around the longitudinal axis of the boring-tool. Thus, assuming that the star wheel isprovided with seven arms, as indicated, it will be caused to revolve one revolution on its own axis with seven revolutions around the longitudinal axis of the cutting-tool, thereby causing said feed-shaft F to revolve one revolution on its axis with seven revolutions of the cutting-tool. It will be understood, however, that the relative speed of the feed-shaft to the cutting-tool may be changed and varied and the feed of the cut ting-tool increased or diminished as circumstances may require by increasing or diminishing the number of arms on the star-wheel. It will also be obvious that while the boringtool may with slight modifications be supported at both ends it is adapted when made, as

shown, with a single supporting-shank to be used With a drill-press or any other machine having a revolving spindle.

Having thus described my'invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a tool for boring tapered holes, the combination of a boring-bar; a screw-threaded feed-shaft having journal-bearings at its respective ends in said boring-bar and having its longitudinal axis arranged at an angle to the longitudinal axis of said bar; a cuttingtool; a tool-supporting carriage; adjustable carriage-supporting ways; a screw-threaded collar mounted upon said feed-bar; means for slidably connecting said tool-supporting carriage with said screw threaded collar and means for revolving said feed-shaft a partial revolution on its longitudinal axis with each revolution of said boring-bar.

2. In a tool for boring tapered holes, the combination of a boring-bar; a screw-thread ed feed-shaft having journal-bearings at its respective ends in said boring-bar and having its longitudinal axis arranged at an angle to the longitudinal axis of said bar; a cutting tool; a tool-supporting carriage; adjustable carriage-supporting ways pivotally connected at one end with said boring-bar and provided at their opposite ends with transversely-arranged bolts having central screw-threaded bearings in said ways and hearing at their protruding ends against said boring-bar; a screwthreaded collar mounted upon said feed-bar; means for slidably connecting said tool-supporting carriage with said screw-threaded collar and means for revolving said feed-shaft a partial revolution on its longitudinal axis with each revolution of said boring-bar.

3. In a tool for boring tapered holes, the combination of a boring-bar; aserew-tln'eaded feed-shaft having journal-bearings at its respective ends in said boring-bar and having its longitudinal axis arranged at an angle to the longitudinal axis "of said bar; a cuttingtool; a tool-supporting carriage; carriage-supporting ways arranged at an angle to the axis of the feed-shaft; a screw-threaded collar mounted upon said feed-bar provided with a vertical socket; a trunnion slidably connected at one end with said screw-threaded collar within said socket and rigidly connected at its opposite end with said tool-supporting carriage and means for revolving said feed-shaft a partial revolution on its longitudinal axis with each revolution oi. said boring-bar.

In testimony whereof I aflix my signature in the presence of two witnesses.

WILLIAM N. JOHN.

Witnesses:

JAs. B. ERWIN, D. (3. JOHN, Jr. 

